Boil water with oil and salt
Add dry spaghetti and cook for 20 min on medium heat till tender
Gently toss with spaghetti sauce
Grated parmesan cheese if desired on top

For breakfast or spaghetti pizza:
Take the spaghetti especially left overs and put it in hot pan with little oil and fry in medium heat
Cook till one side is golden brown and heated throughout
Cut like pizza and serve